Print Product Inspection With Selective Color Dropout for Code Margins
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Solution Overview
Problem
Existing print inspection systems inaccurately determine the presence of margin areas around barcodes and two-dimensional codes due to dropout color processing, leading to incorrect inspection results.
Innovation Solution
Perform dropout color processing only on a first inspection area and conduct second recognition processing to verify the presence of a margin area without dropout color processing, ensuring accurate detection of margin areas around code images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dropout color processing is performed on the entire read image to improve OCR accuracy, then character recognition accuracy is improved, but false positive inspection results occur regarding margin area detection
Solution Approach 1:
The inspection area is divided into a code image area and a margin area. Dropout color processing is selectively applied only to the code image area to improve character recognition, while the margin area is inspected without dropout color processing to ensure accurate detection of margin presence. This segmentation resolves the contradiction by applying different processing methods to different regions.
Solution Approach 2:
Different quality requirements are applied to different parts of the image: the code image area receives dropout color processing enhancement for better recognition, while the margin area maintains its original state for accurate inspection. This local differentiation allows each region to be optimized for its specific inspection purpose.
2Measurement precision
If dropout color processing is applied to remove chromatic color components in the inspection area, then recognition accuracy is improved, but pixels in margin areas are incorrectly eliminated leading to false inspection results
Solution Approach 1:
The inspection system segments the image into code image region and margin region, applying dropout color processing only to the code image region where recognition accuracy needs improvement, while leaving the margin region unprocessed to maintain inspection accuracy regarding margin presence.
Solution Approach 2:
The processing quality is made local rather than uniform: dropout color processing is applied locally to the code image area to enhance recognition, while the margin area is deliberately excluded from this processing to preserve the accuracy of margin detection.
Data Source
AI summary
An inspection apparatus performs dropout color processing on a first inspection area set for an image generated by reading a print product and then performs first recognition processing on the first inspection area, and further performs second recognition processing on a second inspection area set for the image and then performs an inspection of whether sufficient margin areas are allocated on the second inspection area, without performing dropout color processing.